Highly
Active Mixed-Metal Nanosheet Water Oxidation
Catalysts Made by Pulsed-Laser Ablation in Liquids
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Abstract
Surfactant-free mixed-metal hydroxide
water oxidation nanocatalysts
were synthesized by pulsed-laser ablation in liquids. In a series
of [Ni-Fe]-layered double hydroxides with intercalated nitrate and
water, [Ni<sub>1–<i>x</i></sub>Fe<sub><i>x</i></sub>(OH)<sub>2</sub>](NO<sub>3</sub>)<sub><i>y</i></sub>(OH)<sub><i>x</i>−<i>y</i></sub>·<i>n</i>H<sub>2</sub>O, higher activity was observed as the amount
of Fe decreased to 22%. Addition of Ti<sup>4+</sup> and La<sup>3+</sup> ions further enhanced electrocatalysis, with a lowest overpotential
of 260 mV at 10 mA cm<sup>–2</sup>. Electrocatalytic water
oxidation activity increased with the relative proportion of a 405.1
eV N 1s (XPS binding energy) species in the nanosheets
